Jason Priestley takes on Shawn Spencer on 'Psych' -- VIDEO

For the midseason finale of Psych – airing Wednesday, Dec. 14 – Shawn (James Roday) and Juliet (Maggie Lawson) take a romantic getaway, where they befriend another couple played by guest stars Jason Priestley and Jennifer Finnigan. “James and Maggie may see their future a little bit, and I think maybe that intrigues them but terrifies them more than anything,” Priestley tells EW about the episode.

Things, of course, are not exactly as they seem. Priestley and Finnigan’s characters are actually con artists on a Bonnie-and-Clyde run from the law, he says. “[They] pull scams on people and take them for everything that they can and then move on to the next town.” Watch a clip from the episode below, which also features guest star Tony Hale.

Priestley says he’s been a longtime fan of Psych, but it was the chance to work with Finnigan that lured him into guesting on the series. “Jennifer Finnigan and I have been great friends for a very long time,” Priestley says. “We’ve always wanted to work together but have never had the opportunity.”

For Priestley, the episode, which was filmed near Whistler, British Columbia, felt like being on a ski vacation with friends – that is, if your vacation included 14 hours of work. Still, filming was an enjoyable experience for the actor, thanks to his fellow guest star. “Finnigan killed it,” Priestley says. “I found myself sitting back and watching her going ‘Wow, Finnigan is really good’ and that, of course, is such a misstep for an actor.”

Viewers will have to tune in Wednesday to see if Shawn Spencer can bring the criminal pair to justice. And don’t count out Priestley’s return to the series in later episodes. “I personally would love to come back to the show,” he says. “If they ever endeavored to invite me back I would certainly relish the opportunity.”